Origin: Monster Slayer (HB)

You gain the following benefits.

Courageous. Once per day, upon failing a saving throw against an effect that would cause you to become Frightened, you can choose to roll again and keep the better result.

Know Thy Enemy. By collecting three pieces of information regarding a creature, you can choose to designate it as your Quarry for the next 7 days. These pieces of information can be any three amongst the following: its name, its creature type, an accurate description of its appearance, a location it frequents, a routine habit that it has, a piece of evidence of its presence (such as a track or body part). While a creature is designated as your Quarry, you have Advantage on any Search and Study Actions you take in relation to it, and add your Proficiency Bonus to your damage rolls against it. You can have a number of active Quarries up to your Proficiency Bonus at a time.